Signal and control system for elevators



Jan; 5,"

E. M. BOUTON ET AL SIGNAL AND GGNTROL SYSTEM FOR ELEVATORS Filed Sept.9, 1935 7 Sheets-Sheet *1 a mm ON TO Mm F 0 w E WITNESSES 14/27/1017? 7a es Jan. 5, 1937. M BOUTONYET AL 2,066,906

SIGNAL AND CONTROL SYSTEM FOR ELEVATORS Filed Sept. 9, 1935 '7Sheets-Sheet 2 For Car/1 7'07 Cara I INVENTORS /n 4 Edgar/Mfiouzon 9William F5029 f BY I WITNESSES:

Jan. 5, 1937. E. M. BOUTON El AL SIGNAL AND CONTROL SYSTEM FOR ELEVATORS7 Sheets-Sheet 3 Filed Sept. 9, 1933 B. M in i7.

e Swm NW mm m SE Qmm Wm WM v N Q\\-N.@ \vN a M M. .ZY 55% @M BM Rh EJan. 5, 1937- E. M. Bou'roN ET AL 2,066,906

' SIGNAL AND CONTROL SYSTEM FOR ELEVATORS Filed Sept. 9, 1953 vShets-Sheet 4 452 1704022 4 I L I 7 7 '07' Gar A. A

2011/77 SQgmenzs.

\UpS gmems 6 N7 67 WITNESSES: 4? 2/ L- INVENTORS Edgar fiZBowozz F29. 5.I z/izm FTE'a 85 Jan. 5, 1937. E. M. BOUTON ET AL SIGNAL AND CONTROLSYSTEM FOR ELEVATORS Filed Sept. 9, 1955, 7 Sheets-Sheet 5 ATT Jan. 5,1937. E. M. BOUTON ET AL 2,056,906

' SIGNAL AND CONTROL SYSTEM FOR ELEVATORS 7 Filed Sept. 9, 1955 7Sheets-Sheet 6 4H Down For Carl? A flown Segment:

l] El WITNESSES: I 5 V INVENTORS 2% I Edgarfiifiazzzon Z 14/27/10 F, EaI 65.

Patented Jan. 5, 1937 UNITED STATES PATENT OFFICE SIGNAL AND CONTROLSYSTEM FOR ELEVATORS Edgar M. Bouton, Park Ridge, 111., and William F.Eames, Edgewood,

Pa., assignors to West- Application September 9, 1933, Serial No.688,784

38 Claims.

Our invention relates to signal and control systems for elevators andmore particularly to such signal and control systems as may be employedfor operating a bank of elevator cars.

One object of our invention is to provide a signal and control systemwhich will promote the answering of calls and the loading and unloadingof passengers in the most prompt and efilcient manner.

Another object is to give the attendants on the elevator cars suchcontrol over their cars as will result in handling the traffic mostefliciently.

Another object is to cause the stopping of any car to take on aprospective passenger to be directly responsive to the action of apassenger in pressing a button to make a car stop for him.

A further object is to provide a system in which a passengersstop-signal will stop only one car of a bank of cars and that car willbe the nearest car approaching in the direction in which the passengerdesires to travel.

A still further object is to provide an elevator system in which, when aprospective passenger presses a call button to make a car stop for him iin the direction he desires to travel, he will immediately receive a(car will stop) signal from the nearest car approaching in thatdirection, so that he may walk at once to the hatchway door for that carand be ready to step aboard as the door opens.

It is also an object of our invention to provide a signal and controlsystem which will inherently tend to keep the cars of a group properlyspaced to obtain more efficient handling of passengers.

In order to accomplish these and other objects, we have provided anelevator system embodying a group of cars and a signal and controlsystem therefor having the following characteristics and functions.

Each car in the group may be started by means of a car switch in the carand may be stopped by push buttons in the car or by push buttons at thefloor landings. Each car has its own stopping floor buttons as well asits own car buttons and car switch. That is, a plurality of stop pushbuttons will be disposed at each floor, an up button and a down buttonfor each car.

Each button will be provided with an arrow arranged to be illuminated.The arrow will point in the direction of the motion of the car that willstop in response to that button. That is, for an up button the arrowwill point upwardly and for a down button the arrow will pointdownwardly.

At any given time at any given floor only one up direction and one downdirection button will be illuminated, indicating the buttons for thenearest approaching cars in the respective directions.

The illumination of the arrows will be controlled by the cars. Each carwill illuminate all the arrows at all the floors in advance of itsmotion, but only up to the floor corresponding to the car ahead.

When a car approaches the terminal which the car ahead has left, theformer car will light its own arrows to the terminal showing the presentmotion and also its own arrows away from the terminal showing the motionof the first named car up to the second mentioned car. That is, thesignal zone indicated by lighted arrows for the first named car willextend from that car to the terminal and away from the terminal to theleading car. A floor button will be effective to register a call onlywhile its arrow is illuminated.

When an illuminated button at a floor is pressed to register a call, thefloor lantern at that floor for the car corresponding to that button andfor the corresponding direction will light at once regardless of how farthe car is from that floor, to indicate to the passenger that his callhas been registered and which car will answer it. The floor lantern willremain lighted until the car leaves that floor.

The floor lantern at any floor for any car will light when thatcar stopsat the floor, as the result of an operation of a push button in the car.For this reason, two floor lanterns showing the same direction of travelmay be lighted at any given floor, if one car stops for a hall call andthe other for a car call.

A car may be prevented from stopping to answer a floor call, by theoperator pressing a bypass button in the car. When this occurs, floorcalls registered on the bypassing car will be transferred to the nextfollowing car at the time the former passes the floor at which the callis registered, thus only the bypass button and only the motion of the.car transfers the call. The bypass button does not prevent a carstopping in response to calls registered on the car buttons.

When the car attendant presses the bypass button, the illuminated arrowsassociated with the floor buttons for that particular car at floors inadvance of the cars motion will be extinguished and those for the nextfollowing car will become illuminated. Thus any subsequently registeredcall in advance of the cars position will be registered on the followingcar. However, the

fioor lanterns lighted at floors where calls were registered previous tothe bypass operation will remain lighted until the car passes that floorwhen they will be transferred to the following car.

For a better understanding of the invention reference may be had to theaccompanying drawings in which;

Figure 1 is a diagrammatic representation of an elevator installationembodying our improved signal and control system.

Fig. 2 is a view in front elevation of a push button panel embodying amodification of the floor push button panel included in Fig. 1.

Fig. 3 is a view in side elevation of the push button panel shown inFig. 2.

Figs. 4, 5 and 6 collectively constitute a diagrammatic representation,in what is known as the straight-line style, of the signal and controlsystem employed in operating the elevator cars shown in Fig. 1; and

Figs. 4a, 5a and 6a collectively constitute an explanatory illustrationof the relays embodied in Figs. 4, 5 and 6.

The illustration of the relays in Figs. 4a, 5a

' and 6a show them with their coils and contact members disposed onhorizontal lines corresponding to their positions in the straight-line"circuits of Figs. 4, 5 and 6 so that the reader may readily determinethe identification of any relay, the number and kind of its contactmembers and the position of its coil and its contact members in thestraight-line circuits.

For convenience in reading the drawings, Fig. 5 should be placed underFig. 4, Fig. 6 under Fig. 5, Fig. 4a beside Fig. 4, Fig. 5a beside Fig.5 and under 4a, and Fig. 6a beside Fig. 6 and under Fig. 5a.

Referring more particularly to the drawings, we have illustrated anelevator installation embodying two cars A and B for serving four floorsor landings. The cars are suitably suspended by cables II and I2 whichpass over hoisting drums I3 and Bl3 to suitable counterweights l5 andI6, respectively.

Although we have shown only two cars and a signal and control systemtherefore as applied to only four floors, it is to be understood thatthe system is equally applicable to any suitable number of carsoperating past any desired number of floors.

For convenience, the main relays included in the system are designatedas follows:

V=High speed relay for car A.

Q=Brake relay for car A.

Floor call registering relays energized upon the pressing of a floorbutton for car A. One for each car for each direction at each floor.

C=Car button holding or registering coils for push buttons in car A.

S=Floor button stopping relay for car A. R=Car button stopping relay forcar A. E=Inductor relay for decelerating car A. F=Inductor relay forstopping car A. G=Slow down holding relay for car A.

3% }=Zone relays (common to both cars).

[71 Stop call transfer relays (common to UT I both cars) DP Relayspreventing more than one car re- UP ceiving a registered stop call.H=Bypass relay for car A.

J :Auxiliary bypass relay for up direction car A.

K=Auxiliary bypass relay for down direction car A.

N=Up direction preference relay for car A.

M= Down direction preference relay for car A.

The relays for car B are given the same designation as those for car Aplus the letter B. The letters U and D indicate up and down direction.The prefix numerals indicate the fioors. The suffix numerals indicatethe contact members of the relays. For instance, IBU designates the upfloor call registering relay at the first floor for car B and IBUIdesignates one pair of the contact members of that relay.

Referring to the control system for car A as shown in Figs. 4 and 5, thehoisting drum i3 is directly coupled to an armature ll of a hoistingmotor I8, the field winding IQ of which is connected, for constantvoltage energization, to a source of supply designated as the supplyconductors L+ and L.

A variable voltage system of control may be provided for operating thehoisting motor 18 wherein the armature I! is connected in a loop circuitwith the armature 2| of a generator 22. The generator is provided with aseparately excited field winding 23 and a cumulative series fieldwinding 24. A resistor R24 is connected in the circuit of the separatelyexcited field wind ing 23 for stabilizing the operation of thegenerator. The armature 2| of the generator may be driven by a suitabledriving motor 25 which may be connected to a suitable source of supplyas represented by the conductors and switch 26.

A brake 5 operated by a brake magnet 6 is provided for applying abraking effect to the hoisting drum I3 when the car is brought to astop, the brake magnet 6 being energized to re lease the brake 5 whenthe car is running and being deenergized to apply the brake 5 when thesupply of power to the car is cut off.

The direction and speed of the hoisting motor I8 may be suitablycontrolled by controlling the direction and the value of the excitationcurrent that is supplied to the separately excited field winding '23 ofthe generator 22.

The direction of the excitation current for the field winding 23 may besuitably controlled by means of an up direction switch U and a downdirection switch D, while the value of the current supplied to the fieldwinding may be con.- trolled by means of a speed relay V.

The operation of the up direction and the down direction switches U andD, as well as the speed relay V, may be controlled by means of a carswitch CS that is to be mounted on the car in position to be actuated byan attendant thereon. When the car switch CS is moved in a clockwisedirection, its contact members I) and 6 close thereby completing acircuit for energizing the up direction switch U which in turn closesits contact members UI and U4, thereby completing a circuit forenergizing the separately excited field winding 23 in a direction tooperate the hoisting motor 18 to move the car upwardly. At the sametime, the brake magnet 6 is energized to release the brake 5. v

Upon a continued movement of the car switch CS in a clockwise direction,it closes its contact members e and a, thereby energizing the highspeedrelay V to close its contact members VI and thereby eliminate theresistor R24 from. the circuit of the separately excited field winding23.

Any suitable means may be employed which will, when energized,automatically stop the car A level with the floors it serves. As anexample of such a means, we have illustrated the stopping seems asincluding an automatic inductor landing system such as is disclosed inPatent No. 1,88%,4A6, issued October 25, 1932, to K. M. White and G. K.Hearn, assignors to Westinghouse Electric Elevator Company.

The inductor landing system for the car A includes a high-speed inductorrelay E and a stopping inductor relay F for causing the car to beautomatically decelerated from its high speed and brought to a stop atan exact level with the fioor. These relays are mounted on the car A inposition to cooperate with sets of inductor plates lUF, iDF, EUE and EDEof magnetic material mounted in the hatchway. For simplicity, only oneset of inductors for one floor have been shown, but it will beunderstood that a set similar to that shown may be provided for eachfloor served by the car intermediate the upper terminal landing and thelower terminal landing. A set corresponding to the inductor plates iUFand EUE may be provided for the upper terminal landing and a setcorresponding to inductor plates GDP and ZDE may be provided for thelower terminal landing.

As shown, each inductor relay is provided with two sets of contactmembers. The contact mem" bers E! of relay E cooperate with inductorplate ZDE. The contact members E2 of relay E 00-- operate with plateQUE. The contact members P5 of relay F cooperate with the inductor plateHDF. The contact members of inductor relay F cooperate with inductorplate IUF.

The contact members just described are so connected with the car controlcircuits that when the inductor relays are energized to stop the car atthe fioor represented by the inductor plates, in the down direction, thecontact members El first pass the inductor plate 213E and are therebyopened to decelerate the car, and as the contact members Ft comeopposite the inductor plate lDF they open to stop the car level with thefloor. The contact members E2 of relay E and the contact members F2 ofthe relay F are opened by the inductor plates ZUE and lUF, respectively,when the stop is to be made in the up direction.

Once the inductor relays are energized to slow down the car to a stop,it is desirable to maintain them in that condition until they areoperated to bring the car to rest. A slow down holding relay G isprovided for this purpose.

In the elevator system illustrated in the drawings, the energization ofthe inductor relays on car A for stopping that car at a fioor iseffected either by a car button stopping relay R or by a floor buttonstopping relay S. The energization of either of these relays will, asthe car nears a floor at which a stop is to be made, energize theinductor relays and thereby cause the car to decelerate and stop at thatfioor.

The car button stopping relay R is controlled by push buttons in the carA; that is, the pressing of a car button by the car attendant willregister a stop call, or in other words, initiate and maintain a circuitwhich will be completed as the car nears the floor corresponding to thebutton to thereby energize the stopping relay R which will, in turn,energize the inductor relays to stop the car at that fioor.

The stopping relay S is controlled by pushbuttons at the floor landings;that is the pressing of a floor button will register, or in other words,initiate and maintain a circuit which will be completed as the car nearsthat floor and thereby energize the stopping relay S which will, inturn, energize the inductor relays to stop the car at such floor.

The push-buttons mounted in the car A to be operated by the carattendant when he desires to register stop calls to stop the car at thefloors Where passengers desire to get off are designated as A2 and A3,for the second and third floorsrespectively, no buttons being necessaryfor the lower terminal floor and the upper terminal ficer because thecar will be stopped by the usual and well-known limit switches (notshown), as it approaches these terminals.

The push buttons disposed at the floor landings to enable waitingpassengers to register stop calls that will cause the car A to stop attheir floor so that they may board it, are designated as follows: The upbuttons for car A are marked as lUA at the fierst floor, ZUA at thesecond fioor and 3UA at the third floor. The down floor buttons for carA are marked as ZDA at the second floor, 3DA at the third fioor and lDAat the fourth fioor. Inasmuch as the car A does not go below the firstfloor, no down button is provided for the first fioor. Similarly,inasmuch as car A does not go above the fourth floor, no up button isprovided for the fourth floor.

The control system for car B is the same as that just described for carA, there being a set of car buttons B2 and B3 and also separate up floorbuttons and down floor buttons at the fioor landings for car B. The upfloor buttons for car B are designated as IUB at the first floor, EUB atthe second floor, and SUB at the third floor, no up floor button beingshown at the fourth floor because the car does not go above the fourthfloor. The down floor buttons for car B are designated as ZDB at thesecond floor, EDB at the third floor and ADB at the fourth floor, nodown button being shown for the first floor because car B does not gobelow that floor and is stopped thereat by the usual well-known limitswitches.

Associated with the respective car push buttons are car push buttonholding or registering relays 2C and 3C for car A; and EEG and for carB. These relays operate to hold the car push buttons A2 and A3 in car Aand B2 and B3 in car B in a depressed position after they are operatedby the car attendants in making stops from within the cars.

Associated with the floor push buttons for car A are stop callregistering relays EU, EU and 3U for the up direction and 2D, 3D and 5Dfor the down direction. Similar registering relays lBU, ZBU and 3BU areprovided for the up direction. floor buttons of car B and .ZBD, 3B1) QEDfor the down direction. These relays operate to maintain a floor buttoncircuit in a registered condition after that button is pressed until thecar answers the registered call by stopping at the floor. A cancellationcoil is also mounted upon the body of each of these relays for thepurpose of deenergizing it at the time the call is answered.

The up fioor buttons and the down fioor outtons for car A and the upfloor buttons and the down floor buttons for car B at any one floor maybe arranged as desired. However, we prefer to mount the fioor buttonsfor car B at any floor beside the buttons for car A at that floor, asshown in the push button panel 2? in Fig. i. This push button panel maybe said to include the up push button ZUA and the down push button ZDAfor car A and the up push button and the down push button ZDB for car Bat the second floor. The panel is shown as provided with additional pushbuttons for other cars, aI- though, for the sake of simplicity suchother cars are not illustrated or described in the present system.

Inasmuch as each car has its own set of up buttons and down buttons ateach floor, we have provided each button with an arrow arranged to beilluminated to inform the waiting passenger which button should bepressed to stop the nearest approaching car in the direction in which hedesires to go. Although an arrow is provided for each button, only onebutton for each direction will be indicated by an illuminated arrow.Hence, when a passenger approaches the push button panel and desires togo to an upper floor, he will press the button indicated by theilluminated up direction arrow. Thereby the passenger will stop thenearest approaching car going up. Likewise, if a passenger desired to goto a lower floor, he will press the button indicated by the illuminateddown direction arrow and thereby stop the nearest approaching down car.

The up direction arrows for car A (see Fig. 5) are designated as 30 forthe first floor, 3| for the second floor and 32 for the third floor. Thedown direction arrows for car A are designated as 33 for the secondfloor, 34 for the third floor and 35 for the fourth floor. The up arrowsfor car B are designated as 36, for the first floor, 31 at the secondfloor, and 38 at the third floor. The down direction arrows for car Bare designated as 39 for the second floor, 40 for the third floor, andas 4| for the fourth floor.

In order that a waiting passenger may be informed or signalled, when hepresses a floor push button, that his stop call has been registered andalso which car approaching in the direction in which he desires to gowill make a stop at his landing, we have provided a plurality of signalor indicating devices, preferably electric lamps, which are mountedoutside of the elevator shafts at the floor landings.

Each of the top and bottom floors is provided with a single one of thesesignal lamps or floor lanterns for each car; but each of theintermediate fioors is provided with a pair of lanterns for each car,one serving to indicate that the corresponding car is approaching in thedown direction and will make a down stop at the floor, and the otherthat it is approaching in an up direction and will make an up stop. Thissignal is given immediately upon the pressing of the button even thoughthe car may be many floors away.

The floor lanterns for car A (see Fig. 5) are designated as follows: Theup floor lantern at the first floor as IULA, the up floor lantern at thesecond floor as ZULA, the up floor lantern at the third floor as SULA;the down floor lantern at the second floor as ZDLA, the down floorlantern at the third floor as 3DLA and the down floor lantern at thefourth floor as 4DLA.

For car B (see Fig. 6) the up floor lantern at the first floor isdesignated as IULB, the up floor lantern at the second floor as ZULB,the up floor lantern at the third floor as 3ULB, the down floor lanternat the second floor as ZDLB, the down floor lantern at the third flooras 3DLB and the down floor lantern at the fourth floor as lDLB.

When a passenger presses a floor button corresponding to an illuminatedarrow, the floor lantern of the nearest approaching car in the directionhe desires to go is lighted immediately to indicate to him that that carwill stop for him and the hatchway door at which the stop will be made,so that he may at once walk to that hatchway door and be ready to getinto the car as soon as the door opens.

The direction arrows for any one car are arranged to be illuminated atall floors in advance of its motion, but only up to the fioorcorresponding to the car ahead; that is, the car provides ahead of it asignalling zone defined by its arrows to indicate to waiting passengersat the floors in that zone that that car is approaching and will stopfor them if they will press the floor buttons indicated by theilluminated arrows for that direction.

In order to illuminate the arrows in the signal zone in advance of thecar, we have provided a plurality of zoning relays designated as lUZ,ZUZ and 3UZ for the up direction, and ZDZ, 3DZ and dDZ for the downdirection. These zoning relays are common to both cars.

The zoning relays divide the complete round trip shaft travel of allcars into as many signal zones as there are cars operating. And theythen assign one zone to each car. The zone that is assigned to any onecar is the zone in advance of that cars motion. The zone for each car iselastic and keeps moving along with the car, its end being determined bythe position of the next car ahead.

The floor push buttons for any given car which are effective to stopthat car are only those at the floors included in that cars immediatesignal zone; that is, a particular push button is effective to operateonly for that car whose zone includes that push button at that time.

A plurality of preventing relays ZDP, 3DP, 2UP and 3UP are provided forpreventing more than one car receiving a stop signal from the floor pushbuttons at any floor; that is, these relays prevent the registration ofa stop call on any push button whose arrow is not illuminated. Theserelays are common to both cars.

At various times in the operation of the elevator system, a car may beso loaded that the operator may desire to run past the outside stopcalls at various floors. In order to accomplish this purpose, a by-passpush button 43 is mounted in car A and a similar by-pass button 44 ismounted in car B. As long as a car attendant presses the by-pass buttonin his car, that car will not answer or stop at any floor button call,it will not illuminate its own indicating arrows, and it will preventregistration of stop calls on its floor buttons while by-passing. Assoon as the button is released, the car will again respond to outsidecalls, light its arrows, etc.

A by-pass relay H is provided for energization by the pressing of theby-pass button 43 in car A to so modify the control circuits as toeffect the various functions described in the by-passing of car A.Similarly, a by-pass relay BH is provided for energization by thepressing of the by-pass button 44 in car B.

When an attendant presses a by-pass button and thereby causes the car topass a registered floor call without stopping, it is desirable to havesuch floor call transferred to the next following car. To provide forthis signal transfer in an automatic manner, we have provided signaltransfer relays ZUT and 3UT for the up direction, and ZDT and 3DT forthe down direction. These relays are common to both cars and areprovided for only the second and third floor, no such relays beingprovided for the terminal floors as it is obvious that each car muststop at the terminal floors regardless of stop calls.

As an aid in carrying out the automatic transfer of the floor stopsignals, we have provided a plurality of auxiliary by-pass relays. Theauxiliary by-pass relay for the down direction of car A is designated asJ, that for the up direction of car A as K. The auxiliary by-pass relayfor the down direction of car B is designated as BJ and that for the updirection of car B as BK.

In order that the various circuits for the push buttons, floor lanterns,and the relays heretofore mentioned may be. connected at the correcttime and in accordance with the position of the cars, the cars A and Bare provided, respectively, with floor selectors FSA and FSB.

Upon referring to Fig. 1, it will be observed that the floor selectorFSA comprises a vertically mounted base panel 46 upon which are securedsuitable guide rails 4'! for a pair of vertically movable cross-headmembers 48 and 49. The cross-head members are mechanically connectedtogether by means of a chain 50 which passes over an idler sprocket irotatably mounted on the base panel 46 and a. driving sprocket 52rotatably supported by means of a casing 53 mounted on the base panel46.

The casing 53 contains suitable gearing (not shown) for transmitting themotion of a telemotor receiver 54, to the driving sprocket 52. Thetelemotor receiver 54 is operated by a telemotor transmitter 55 which isdirectly coupled to the shaft of the hoisting motor I8 and, therefore,operates in accordance with the movements of the car.

The floor selector FSA is so operated by the telemotor receiver andtelemotor transmitter that the movements of the elevator car A arereproduced on a reduced scale by the movements of the cross-head members48 and 49.

As is usual in floor selectors, a plurality of up brushes 60, BI, 62,63, 64, 65, 65a, 66 and 67 (see Fig. 5) are so mounted on the upcrosshead 48 as to move over and engage cooperating up contact segments16, H, 12, 13, 74, 15 and 16 on the face of the floor selector when thecar is operated.

In a similar manner, a plurality of down brushes 86, 8!, B2, 83, 8 85,85a, 86 and 81 are mounted on the down cross-head 49 in such manner asto engage a plurality of down contact segments 90, 9B, 92, 93, 64, 95and 96 on the face of the floor selector when the car is operated.

Therefore, as the cross-heads move up and down, the brushes engage thecontact segments for various floors in accordance with the movements ofthe car; that is, there are contact segments for each floor and thebrushes are operated to engage the contact segments corresponding to thefloor at which the car is located.

The brushes engage their cooperating contact segments. during both theup movements and the down movements Therefore, in order to make the upbrushes electrically effective only during upward movement of the carand the down brushes electrically effective only during downwardmovement of the car, we have pro vided a plurality of directionpreference relays. The up direction preference relay for car A isdesignated as N and the down direction preference relay as M.

The up preference relay N is so constructed and connected that thebrushes on the up crosshead 48 are electrically effective as thatcross,-

head is moved downwardly on the select-or by the upward movement of thecar; that is, as the cross-head 48 moves downwardly it electrically andselectively connects the circuits for the floors in accordance with themovement of the car past the floors on its up trip, and disconnects thebrushes during the upward movement of the cross-head 48 by the downwardmovement of the car.

The down preference relay M electrically connects the brushes on thedown cross-head 49 with the floor circuits during the downward movementof the cross-head by the downward movement of the car, and disconnectsthem during the upward movement of the cross-head 49 by the upwardmovement of the car.

In other words, the down movement of the cross-head 48 reproduces thecars up movement. The down movement of the cross-head 49 reproduces thecars down movement.

The means for energizing the direction preference relays N and M inaccordance with the direction of operation of the car comprise a pair oflimit switches 56 and 51 disposed on the floor selector FSA. As thecross-head i9 completes its downward travel in connecting the downcircuits, it strikes and opens the limit switch 56, thereby energizingthe up preference relay N to connect the up side of the floor selectorfor the up trip of the car. When the up crosshead completes its downwardtravel in connecting the up circuits, it strikes and opens the limitswitch 51 thereby energizing the down preference relay M to connect thedown side of the floor selector for the down trip.

The group of contact segments 16 under the brush 6!! lights the up floorlantern for car A when the car is stopped by an up registered car call.

The group of contact segments ll under brush 6| feeds the illuminatedarrows in the cars signal zone and lights the floor lanterns at floorsat which stop calls are registered on the floor buttons. The brush 6|has a long bearing surface so as to bridge the gap between the contactsegments as it passes from one to the other. This prevents blinking ofthe lights.

The group of contact segments '52 under brush 62 completes the circuitfor cancelling the up floor button calls when they are answered.

The group of contact segments F3 under the brushes 63 and 66 are fed bythe floor button registering relays for the purpose of energizing thefloor button stopping relay when the car approaches a floor at which astop is to be made in response to the pressing of an up floor button.When a call is to be transferred from this car to another car, the brush63 is electrically disconnected to prevent energization of the stoppingrelay of this car, and brush 66 is electrically connected to brush 6! toeffect energization of the floor button stopping relay of the followingcar.

The group of contact segments 14 under the brush 64 are energized by thecar buttons so that the approach of the car to a. floor corresponding toa floor for which a car button has been pressed will cause theenergization of the car button stopping relay and thereby stop the carat that floor.

The group of contact segments l5 under the brushes 65 and 65a are thesegments through which the zoning relays are energized, in accordancewith the position and movement of the car.

Ordinarily, one long brush might be employed to prevent flickering ofthe lighted arrows as the car moves from segment to segment, but the twobrushes 65 and 65a, instead of one long brush, are provided to preventsneak circuits from the brushes of one car through the brushes of theother car to the zone relays, which are common to both cars. Thesebrushes are electrically connected by the direction relay K when the caris making an up trip, so that the zone relays will be maintained whilethe car is passing from brush to brush but are electrically disconnectedwhile the car is going down.

The group of contact segments 16 under the brush 01 serve to pick up arelay which energizes the contact segments ll of all other cars toeffect a transfer by reason of the operation of the bypass buttons. Itmay be noted here that the brushes 6B and 61 are disposed in an.advanced position relative to the position of the brushes 62, 62, etc,so that they may be utilized in effecting a. transfer of a stop callfrom the car they represent to the next approaching car. In practice,the distance of the advance may be any suitable amount such as maycorrespond to one-half floor travel of the car.

The group of down contact segments 90 to 96 disposed to be engaged bythe brushes to 01 on the down cross-head 49 are similar to thosedescribed for the up side of the floor selector except that they arearranged to complete the various down circuits when the car is travelingdownwardly.

Inasmuch as the floor selector for car B is the same as that for car A,a detailed description thereof will not be given. However, it may benoted that the same designating numerals will be given to similar partswith the letter B in front to indicate that they are for car B insteadof car A.

The system may be operated as follows:

Assume that car A is standing at the upper terminal and that car B isstanding at the lower terminal. Assume also that only car A will beoperated at present and that car B will be left standing at the lowerterminal. The operation of car A will not be affected in any manner bycar B standing at the lower terminal without be ing conditioned foroperation.

The master switches 26 and 28 (Fig. 4) are closed to condition car A foroperation.

The closing of the master switch 26 connects the driving motor 25 forenergization by a suitable source of energy (not shown). Theenergization of the driving motor operates the generator 22 forsupplying energy to the hoisting motor l8. However, inasmuch as theseparately excited field winding 23 of the generator is not energized,no current flows through the circuit to the hoisting motor and itremains idle.

The closing of the master switch 28 prepares the control circuit foroperating car A by energizing the field winding 19 of the hoisting motorl8, the down floor lantern or signal device ADLA at the upper terminal,the down direction preference relay M, the auxiliary by-pass relay J forthe down direction, and the holding or registering coils 3C and 2C forthe push buttons in car A.

The circuit for the lighted lantern 4DLA ex tends from. supply conductorL+ (Fig. 5) through the lamp, contact segment I00, brush 80, the contactmembers M4 of down direction preference relay M and the normally closedcontact members V4 of the high-speed relay for car A to the supplyconductor L.

The circuit for the down direction relay M extends from supply conductorL+ (Fig. 4) to conductor IN, the limit switch 55, the coil M and thenormally closed contact members NI of up direction preference relay Nfor car A to supply conductor L-.

The circuit for the auxiliary by-pass relay J for the down directionextends from supply conductor L+ through conductor I01, the contactmembers M2 of down direction preference relay M, the coil J and thenormally closed contact members HI of the by-pass relay for car A tosupply conductor L.

The circuit for the car button holding coils 3C and 2C extends from thesupply conductor L+ through conductor IN, the coils 3C and 2C and thecontact members Milv of relay M to the supply conductor L-.

Inasmuch as the variable voltage system and the control system foroperating car A have been placed in condition for operation, the car isnow ready to be moved downwardly. To accomplish this purpose, the carattendant moves the car switch CS in a counter-clockwise direction tothe first point, thereby energizing the down direction switch D foroperating the hoisting motor by a circuit extending from the supplyconductor L+ (Fig. 4) through the contact members e and c of switch CS,the contact members U5 and Fl, the coil D, the door and gate interlocksI02 and the coil. Q of the brake relay for car A to the supply conductorL-.

The energization of the down direction relay D closes its contactmembers D5 to provide a self-holding circuit for itself and also closesits contact members D4, D2 and D3 for energizing the brake relay coil 8and the separately excited field winding 23 of the generator 22.

The energization of the field winding 23 causes the generator 22 tosupply current to the hoisting motor l8, which, in. turn, operates thehoisting drum l3 to lower the car in the hatchway (not shown).

The operation of the hoisting motor l8 also operates the telemotor 55mounted on the shaft thereof for controlling the operation of thetelemotor receiver 54, which, in turn, moves the cross-head 49downwardly in accordance with the movement of the car. Thus the movementof the car switch to the first point 0 starts the car downwardly at alow speed comparable to the usual landing speed. The car switch is nowadvanced to engage its second point I to complete a circuit forenergizing the high-speed relay V to run the car at its normal highspeed. This circuit extends from the supply conductor L+ (Fig. 4)through the contact members e and j of car switch CS, the contactmembers El and the coil V to the supply conductor L-.

The energization of the high-speed relay V closes its contact members VIto eliminate the resistance R24 from the circuit of the field winding 23of the generator 22, thereby causing the variable voltage system tooperate the car at high speed.

The energization of the speed relay V also closes its contact members V2to complete a self-holding circuit for itself, which will cause the carto continue running at high speed until it is decelerated and stopped bythe pressing of a push button in the car or by the pressing of a pushbutton at one of the floors. Hence it is seen that the car is started bythe car attendant closing the car switch CS and is stopped by theregistration of calls on the push buttons. The car switch CS may bereturned to its central or neutral point as soon as the car attains theLil desired speed, because its position has no effect on the stopping ofthe car.

The energization of the relay V also opens its contact members V4 (Fig.5), thereby extinguishing the down floor lantern lDLA for car A at thefourth floor as the car leaves that floor.

Car A is now on its downward trip at high speed and it will be assumedthat the car attendant presses the car button A3 to stop the car at thethird floor. The pressing of the button A3 causes it to be held in itsclosed position by the energized holding coil 3G, in which position itscontact members close a circuit for supplying energy to the contactsegment Hi3. As the car approaches the third floor, the floor selectorbrush 8% engages the energized contact segment I03, thereby energizingthe car button stopping relay R of car A. The circuit extends fromsupply conductor L-lthrough the contact members of push button A3,contact segment I03 of the floor selector, the brush 83, the contactmembers MB of down direction relay M and the coil of stopping relay R tothe supply conductor L-.

The energization of the stopping relay R closes its contact members E!(Fig. 4) thereby energizing the slowdown holding relay G and thedecelerating inductor relay E by a circuit extending from the supplyconductor L+ through conductor Hi l, the contact members R! to a pointwhere it divides and eXtends in parallel through the coils G and E,thence through the contact members Q2 to the supply conductor L.

The energization of the slowdown holding relay G closes its contactmembers GI, thereby providing a self-holding circuit for the relays Gand E.

The energization of the decelerating inductor relay E prepares thatrelay to be operated when the car arrives within such a predetermineddistance of the third floor as to cause the relay E to come opposite thecooperating decelerating inductor plate ZDE for the third floor.

Assuming that the inductor relay E now comes opposite the inductor plateZDE, the energized condition of the relay causes it to be operated byits position adjacent to the plate to open its contact members El,thereby deenergizing the high-speed relay V to decelerate the car.

The deenergization of the high speed relay V opens its contact membersVI (Fig. 4), thereby reinserting the resistor H24 in the circuit of thegenerator field winding 2% to cause the car to be decelerated from itshigh speed to its landing speed.

The deenergization of the high speed relay V also closes its contactmembers V3, thereby enerthe stopping inductor relay F to stop the carupon its arrival at the third floor.

The deenergization of the high speed relay V also closes its contactmembers V4, thereby completing a circuit for lighting the down floorlantern ilDLA at the third floor, the circuit extending from the supplyconductor L-l- (Fig. 5) through the lamp SDLA, the contact segment I01,the brush 8% now in engagement therewith, the contact members M l ofdirection preference relay M and the contact members V4 of the highspeed relay V to supply conductor L. The lighting of the floor lanternserves to notify any passenger who may be waiting at the third floorthat the car will stop at that floor on its down trip.

As the car continues at slow speed toward the third floor, the stoppinginductor F comes opposite the inductor plate ii)? and thereby operatedto open its contact members Fl (Fig. 4)

for deenergizing the down direction switch D and the brake relay Q tostop the car.

The deenergization of the down direction switch D opens the circuit forthe generator field winding 23, thereby deenergizing the hoisting motorIt, and the deenergization oi the brake relay Q opens its contactmembers Ql, thereby deenergizing the brake magnet 6 which operates thebrake 5 to stop the car.

The deenergization of the brake relay Q also opens its contact membersQ2, thereby deenergizing the slow down holding relay G, the high speedinductor relay E and the stopping inductor relay F.

The matter of lighting the zone arrows for indicating the floor pushbuttons will now be considered.

The zone arrows for car A are lighted through a ring circuit associatedwith that car comprising a pair of vertical conductors 5H] and MI (Fig.5). This zone ring circuit is divided into sections by the contactmembers of the zone relays and each section is connected to an arrow.Each section is also connected to one of the contact segments traversedby the contact brushes t5 and 6501. on the up trip and by the contactbrushes 85 and 85a on the down trip. When some of the zone relay contactmembers are opened, the loop circuit is divided into correspondingzones, the number of sections in each zone depending upon which zonerelay contact members are opened. The arrows in that zone of the ringcircuit connected to the supply conductor L- by the brushes on the floorselector are lighted when the car is conditioned for operation. If onlyone pair of contact members in the loop circuit are opened, all of thearrows will be lighted, but when two pairs of contact members areopened, only the arrows corresponding to the sections controlled therebywill be lighted.

When the car stops at an intermediate floor, one zone brush will engageone contact segment and the other zone brush will engage the nextcontact segment in advance thereof. Hence two zone relays will then beenergized and consequently the contact members on each side of the floorat which the car is standing are opened thereby extinguishing the arrowfor that intermediate floor.

However, it should be noted that the arrow at ing circuit establishedthe registered call, but 4 when the car is standing at a terminal floor,the arrow will be lighted because the zone brushes are resting on onlyone contact segment. These two exceptions will not cause anyinconvenience in. the use of the system, however, because if a car isstanding at a floor, a waiting passenger may board it and it will notmake any difference whether the arrow for that floor is lighted or dark.

When car A has been standing at the upper terminal and has beencontrolled for operation and ready to start on its down trip, the brush85a engages the down contact segment H36, thereby energizing the zonerelay BDZ to open its contact members 3132i (Fig. 5) at the third floor.Inasmuch as no relay was energized to open the circuits for the arrowsthe other floors for car A, the down arrows and at the third and secondfloors respectively and the up arrows 3i and 2-2 at the first, secondand third floors respectively were lighted to indicate that the car Awas the nearest car approaching in the direction indicated by thearrows.

For instance, the lighted down arrow 34 beside the floor push button EDAat the third floor indicates which button should be pressed for the nextdown car. In a similar manner, the lighted up arrow 3! adjacent the uppush button ZUA at the second floor indicates to any waiting passengerthat the push button ZUA should be pressed to stop the next up car. Inother words, the lighted arrows illuminated the buttons which should bepressed by waiting passengers to stop the next car approaching in thedirection in which they desired to go.

Car A being the only car in operation, all of its floor push buttonarrows were lighted, both in the up and the down direction.

The circuit for lighting each of the arrows for car A while it stood atthe upper terminal extended from the supply conductor L+ through eacharrow to the zone loop circuit provided by the conductor H and thencethrough conductor I53, contact segment "39, brush 8|, and contactmembers Jl and H2 to the supply conductor L- Referring again to car Amoving to the third floor, as the car came to the third iloor, the adVance brush 85 engaged the down contact segment I08 for the second floorthereby energizing the zone relay 2DZ, which opened its contact membersEDZI in conductor 1 It to control the circuit for the illuminatedarrows.

The opening of the contact segments 2DZi in addition to the open zonerelay contact segments 3DZI will prevent the illumination of the arrow35 at the third floor while car A stands at that floor because brush 8|is slightly in advance of the other brushes on the floor selector andhas run off of down contact segment I09 for the third floor. Hence,while the car is standing at the third floor all of the up and the downarrows indicating its floor buttons will be lighted at the variousfloors except the down arrow for the third floor.

With the car A standing at the third floor on a down trip, it will beassumed that a waiting passenger at the second floor, desirous of makingan up trip. presses the up push button ZUA indicated by the illuminatedup arrow 3|. The operation of this push button will cause the car tostop at the second floor when it next approaches that floor on an uptrip.

The pressing of the button 2UA closes the circuit for energizing thecall registering relay 2U, which circuit extends from the supplyconductor L+ (Fig. through the contact members of push button ZUA, thecoil 2U, the contact members ZUPI of the preventing relay 2UP, thevertical conductor H0 including the contact members 2UZI and IUZI,horizontal conductor Hi, contact segment H2, brush 8|, the contactmembers J I of auxiliary bypass relay J and the contact members H2 ofthe bypass relay H to the supply conductor L-.

The energization of the registering coil 2U closes its contact members2U4 and H12 to provide a self-holding circuit for itself, whereby thecall may be said to be registered. That is, a single pressing of thebutton ZUA is suflicient to energize the registering coil 2U and causeit to remain energized until the call is answered by the stopping of thecar. The self-holding circuit' extends from the supply conductor L+through contact members 2U4, the coil 2U, the

contact members 2172 and conductor H3 to supply conductor L.

The energization of the registering coil 2U also closes its contactmembers 2U3 which causes the up signal lantern 2ULA at the second floorto light immediately, thereby immediately indicating to the passengerupon the pressing oi the button that his stop signal has been registeredand that the car will stop for him when it arrives at that floortravelling in the up direction. The circuit for this lamp extends fromthe supply conductor L+ through the lamp 2ULA, contact members 2 33 and2U2 and the vertical conductor H3 to supply conductor L-.

The closing of the contact members 2U4 by the energlzation of the relay2U also supplies electric current to the contact segment H5, thuspreparing a circuit for energizing the stopping relay S when the carapproaches the second floor on its up trip.

Assuming that the car A is now started downwardly from the third floor;as previously described, the relays M and J, the holding coil 20, thestopping relay R, the floor lantern 3DLA, and the zoning relays 3DZ and2DZ remain energized. As the car starts, the down direction switch D,the brake relay Q and the high speed relay V are energized as beforedescribed in starting the car.

The energization of the high speed relay V opens the circuit for thedown floor lantern 3DLA and extinguishes it as the car leaves the thirdfloor. The brush 84 leaves the contact segment l 1'23 and therebydeenergizes the stopping relay R as the car leaves.

As the car A continues on down to the second floor, the zone brush 85aleaves the contact segment I06, thereby opening the circuit anddeenergizing the zone relay 3DZ. As the car continues downwardly, thebrush 85 engages the contact segment I I6, thereby energizing the zoningrelay IUZ by a circuit extending from the supply conductor L+ throughzoning relay IUZ, contact segment I I5, brush 85, the contact members J4of the auxiliary bypassing relay J and the contact members H3 of thebypass relay H to the supply conductor L-.

Further movement of the car downwardly causes the brush 85a to leave thecontact segment H1, thereby deenergizing the zoning relay ZDZ.

As the car approaches the lower terminal, it is decelerated and stoppedby the usual mechanically operated limit switches (not shown). Theoperation of the limit switch deenergizes the high speed relay V, thedown direction switch D, and the brake relay Q, thereby stopping the carat the lower terminal.

The deenergization of the down direction switch and the opening of thelimit switch 56 on the floor selector deenergizes the down directionpreference relay M thereby energizing the up direction switch N. Thecircuit for the up direction switch N extends from the supply conductorL+ (Fig. 4) through conductor I01, the contact members of limit switch51, the coil N and the normally closed contact members Ml of downdirection relay M to the supply conductor L.

The energization of the up direction relay N opens its contact membersNI to lock out the down direction relay M.

The closing of the contact members N2 of the up direction relay Nenergizes the auxiliary bypass relay for the up direction relay K forthe up direction of car A.

The opening of contacts M2 of the deenergized relay M deenergizes theauxiliary bypass relay J.

The opening of the contact members M3 of the down relay M deenergizesthe car button holding coils 3C and 20 thus restoring the car pushbutton A3 to its normal condition. The subsequent closing of the contactmembers N3 of the up direction relay N reenergizes these coils for theup direction.

The deenergization of the town direction relay M and the auxiliary downdirection relay J cause the contact members M4, JI, M5, J2, M6, J3 and J4 to open thereby electrically disconnecting the brushes on the downcross-head 49 from the car control circuits while the car is on the uptrip. On the other hand, the energization of the up direction relay Nand the up direction auxiliary relay K cause the contact members N4, KI,N5,

2, N5, K3, K4 and N1 to close thereby electrically connecting thebrushes on the up crosshead 48 to the control circuits for the up trip.

Inasmuch as the car is standing at the lower terminal with the brush 60on the contact segment I20 for the first floor, the closing of thecontact members N4 causes the up floor lantern IULA at the bottomterminal to be lighted by a circuit extending from the supply conductorL+ (Fig. 5) to the lamp IULA, the contact segment I2ii, brush GB,contact members N4 and contact members V4 to the supply conductor L.

Inasmuch as the car is standing at the first floor, the advance brush B5is disposed in engagement with the up contact segment I2! and the floorselector is energized for the up direction, the zoning relay 2UZ isenergized by a circuit extending from the supply conductor L+ throughcoil ZUZ, contact segment I2I, brush 65, the contact members Kt and thecontact members 1-13 to the supply conductor L. Hence we can see that asthe car moves from floor to floor the zoning relays will be energizedsequentially but always with overlapping periods of energization so thatthe lighting of the direction arrows located beside the floorpushbuttons for car A keeps traveling along with and in advance of thecar and back to the car, but the arrow at any intermediate floor atwhich the car positioned corresponding to the direction in which the caris traveling is not lighted.

The deenergization of the down direction auxiliary relay J also openedits contact members J5 and J 4 thereby deenergizing the zoning relay IUZand restoring that portion of the loop circuit.

The car A is now ready for the up trip.

The car attendant now moves the car switch CS in a clockwise directionto start the car in the up direction. This movement energizes the updirection switch U and the relay Q by a circuit extending from the lineconductor L+ (Fig. 4) through the contact members e and b of the carswitch CS and contact members DI and F2, the coil U, the door and gatecontact members I02, and the coil Q to the supply conductor Li.

The energization of the brake relay Q closes its contact members QIthereby energizing the brake magnet to release the brake to permitmovement of the car.

The energization of the up direction switch U closes its contact membersUI and U4 thereby completing a circuit for the field winding 23 of thegenerator 22, which circuit extends from the supply conductor L+ throughcontact members U! the field winding 23, the contact members U4 andresistance R24 to the supply conductor L.

The closing of the contact members U2 of the up direction switchcompletes a self-holding circuit to keep the car in operation until itis stopped by operation of a push button either at one of the floorlandings or within the car.

Assuming that the car attendant moves the car switch still further inthe clockwise direction to accelerate the car to its normal high speed,then the high speed relay V is energized to close its contact members VIand short circuit the resistor R25 for the purpose of causing the car torun to its normal high speed. This circuit extends from supply conductorL+ through contact members e and a of the car switch CS, contact membersE2, and the coil V to the supply conductor L.

The energization of the high speed relay V opens its contact members V4thereby extinguishing the up direction floor lantern IULA at the firstfloor.

As the car moves upwardly and approaches the second floor, the brush 63engages the contact segment H5 thereby energizing the floor buttonstopping relay S to effect the stopping of the car at the second floor.This circuit extends from the supply conductor L-]- (Fig. 5) through thenow closed contact members 2U4, conductor I22, the contact segment H5,brush 63, the contact members K2 and the coil S to the supply conductorL-.

Energization of the floor button stopping relay S closes its contactmembers SI, thereby energizing the slowdown holding relay G for car Aand the deceleratinginductor relay E. This circuit extends from supplyconductor L+ through conductor Hi4, contact members SI, in parallelthrough the coil G and the coil E, and thence through the contactmembers Q2 to the supply conductor L.

As the car continues its approach to the second floor, the high speedinductor relay E comes opposite its cooperating inductor plate ZUE andis operated thereby to open its contact members E2 thereby deenergizingthe high speed relay V to decelerate the car from its high speed to itslanding speed.

The deenergization of the relay V closes its contact members V4 tomaintain the floor lamp ZULA in its lighted condition while car A stopsat the second floor.

The deenergization of the relay V also closes its contact members V3thereby energizing the stopping inductor relay F.

At this point in the movement of the car, the brush 65 engages thecontact segment I24 thereby energizing the zoning relay SUZ to maintainthe correct zone by a circuit extending from the supply conductor L+through the coil 3UZ, contact segment I24, brush 65, contact members K4,and contact members H3 to the supply conductor L.

As the car moves in close to the second floor, the energized inductorrelay F comes opposite the stopping inductor plate lUF and is therebyoperated to open its contact members F2. The opening of the contactmembers F2 deenergizes the up direction relay U and the brake relay Q,which in turn deenergize the slowdown holding relay G, the high speedinductor relay E and the stopping inductor relay F.

The deenergization of the down direction switch U and the brake relay Qcauses the car to stop at the second floor of its up trip in response tothe operation of the floor push button 2UA by the waiting passenger atthe second floor.

Assuming now that the waiting passenger boards the car, the door andgate H32 are closed and the car attendant operates the car switch CS toagain start the car in the up direction. The operation of the car switchwill cause the energization of the up direction relay U, the brake relayQ and the high speed relay V, as previously described. As the car leavesthe second floor, the brush 63 leaves the contact segment II5, therebydeenergizing the floor button stopping relay S.

The energization of the high speed relay V also opens its contactmembers V4, extinguishing the floor lantern 2ULA as the car leaves thesecond floor.

As the car A continues its upward trip the brush 62 engages the contactsegment I25 thereby energizing the cancellation relay I2Ii by a circuitextending from the supply conductor L+ through the now closing contactmembers 2U4, coil I26, contact segment I25, brush 62, and the contactmembers N5 to the supply conductor L. The energization of thecancellation coil I26 opposes the energization of the registering coil2N4 and thereby deenergizes that coil to cause it to open its contactmembers to deenergize the coil. The deenergization of the relay 2U opensthe contact members 2U4 and thereby restores the relay to its normalnonoperated condition.

Further, as the car A moves upward, the brush 65 leaves the contactsegment I2I thereby deenergizing the zone relay ZUZ to maintain thecorrect zone for that car.

It will be assumed that the car A is operated as previously describeduntil it stops at the top floor and starts down and stops at the thirdfloor. With car A standing at the third floor, as before, the downlantern 3DLA for car A at the third floor is lighted and the followingrelays are energized; down direction relay M, down bypass relay J, carbutton holding coils 3C and 20, zone relay 3DZ and zone relay 2DZ.

The car B will now be placed in operation with car A by closing themaster switch B26 (Fig. 4). The closing of this switch connects thedriving motor B25 to a source of electrical energy (not shown). Theenergization of the driving motor operates the generator B22 forsupplying current to the hoisting motor BIB to operate the hoisting drumBI3. field winding B23 of the generator is not energized, no currentflows through the circuit to the hoisting motor and it will remain idleuntil one of the direction switches for car B is operated to start thecar.

A control switch B28 is also closed to place the control circuit for carB in operation by energizing the field winding BI9 of the hoisting motorBIB, the up direction preference relay BN, the auxiliary by-pass relayBK for the up direction, the push-button holding or registering coils33C and 2B0 in the car and the up floor lantern IULB at the lowerterminal for indicating that the car is standing at that floor.

The circuit for the up direction relay BN extends from the supplyconductor L+ through conductor I30, the contact members of the motortransmitter B55, the coil BN and the contact members BMI to supplyconductor L.

The circuit for the auxiliary by-pass relay BK for the up directionextends from the supply conductor L+ through the conductor I30, thecontact members BMZ, the coil BK and the contact members BHI to thesupply conductor L.

The circuit for the car button holding coils 33C and 2B0 extends fromthe supply conductor L+ through conductor I30, the coils 3BC andInasmuch as the separately excited 2BC and the contact members BN3 ofrelay N to the supply conductor L.

The circuit for the lighted lantern IULB extends from the supplyconductor L+ (Fig. 5) through the lamp IULB, the contact segment I32,brush B60, the contact members BN4 and the contact members BVfl to thesupply conductor L.

In considering the lighted arrows for car B, it may be noted that car Bhas a zone loop or ring circuit provided by the vertical conductors I33and I36 (Fig. 6) to which the arrows for car B are connected. This ringcircuit is practically a duplicate of the zone ring circuit for car A.The ring circuit for car B is controlled by the second pair of contactmembers on each zone relay; that is each zone relay has two pairs ofnormally closed contact members. one pair being in the ring circuit forcar A and the other pair being in the ring circuit for car B. Thus whenany zone relay is energized, it opens one pair of contact members ineach circuit. Inasmuch as the zone relays are common to both cars andare controlled by the position of the cars, they operate to divide thelighted arrows into zones, one zone for each car, as will be betterunderstood by continuing the operation of car B.

Inasmuch as the car B is standing at the lower terminal, brush B65engages the contact segment I2? thereby energizing the zone relay 2UZ bya circuit extending from the supply conductor L+ (Fig. 5), the coil 2UZ,conductor I33 to the contact segment I21 (Fig. 6), the brush 1365, thecontact members BKA and the contact members EH3 to the supply conductorL-.

The operation of this zone relay ZUZ opens its contact members 2UZI andits contact members 2 3222, thereby dividing the lighted arrows for carA and the lighted arrows for car B into two zones one zone for car Bextending upwardly from car B to the upper terminal and down to car Aand the other zone for car Z extending from car A at the third floor tocar B at the lower terminal.

The lighted arrow zone for car B comprises the lighted up arrows 36, 31and 38 indicating respectively the up floor push buttons IUB at thefirst floor, ZUB at the second floor and 3UB at the third floor.Therefore, waiting passengers at these floors desiring to travelupwardly should operate the buttons for car B indicated by theilluminated arrows to make car B, which is the nearest car in thecorresponding direction, stop for them as it moves upwardly.

The operation of the zone relay 2UZ also causes the down direction arrow4| beside the push but- 5 ton. IDB for car B at the top floor to belighted.

The lighted arrow zone for car A, by reason of the operation of the zonerelays, extends only from car A at the third floor on its down trip tothe lower terminal. In view of the small number of floors in the presentinstallation, this means that the down arrow 33 for car A at the secondfloor and the up arrow 30 for car A at the lower terminal are lighted.The lighted arrow 33 indicates that waiting passengers at the secondfloor desiring to go down, should press the down push button ZDA for carA to stop that car as it comes to that floor because it is the nearestin the direction in which they desire to go. The circuit for the lightedarrow 33 extends from the supply conductor L -I- through the arrow 33,the contact members 2DPI of preventing relay ZIDP, conductor III,contact segment II2, brush 8!, the contact members J I and H2 to thesupply conductor L. The lighted arrow 30 is in parallel with the lightedarrow 33, the circuit extending from the supply conductor L+ througharrow 30, the contact members IU3, conductors Ill) and III, contactsegment II2, brush Ill and contact members J I and H2 to the supplyconductor L.

The circuit for the lighted arrows 33 and 30 cannot extend to any otherarrow because the zone relay contact members ZDZI and ZUZI in thevertical conductor III! are open.

The circuit for the up lighted arrows 31 and 38 and the down arrow 4!for car B extends as follows: For arrow Si from supply conductor L+through arrow 37, contact members 2UP2, conductor I34, contact segmentI35, brush Bfii, contact members BKI and BHZ to supply conductor L forarrow 38 the circuit extends from supply conductor L-|- through arrow38, contact members 3UP2, conductor I37, contact members 3UZ2 inconductor I33 and thence through conductor I34, etc. to the supplyconductor L; and for down arrow 4I the circuit extends from supplyconductor L+ through arrow 4|, contact members 4BD3, conductor 23$,contact members 4DZ2 and again along conductor I36 to the lower part ofthe drawing where it joins conductor I37 and thence through contactmembers BUZZ, conductors I33 and I34, etc. to the supply conductor L-,the three arrows being in parallel. It will be observed that the circuitdoes not extend to any other arrows for car B because the contactmembers 3DZ2 and 2UZ2 in the conductor I39 are open by reason of thezone relays 3DZ and ZUZ being energized.

Hence it will be seen that when a passenger comes to a floor to board anelevator car for, say an up direction, all he needs to do is to pressthe push button indicated by the lighted arrow for the direction hedesires to go and that operation of the button will immediately causethe lighting of the signal lantern over the doorway at which the carwill stop so that he may at once walk to that door and be ready to boardthe car when it does come and in addition, the operation of the 1 pushbutton will cause the car corresponding to that button to stop when itarrives at that floor, regardless of the position of the car switch orthe actions of the car attendant, unless the car attendant should pressthe by-pass button to bypass the call.

With both of the cars in operation, it will be assumed that a waitingpassenger at the second floor desirous of making an up trip, observes,by the lighted arrow 31, that the push button 2UB should be operated forstopping a car for an up trip. The passenger thereupon presses thebutton 2UB and thereby registers a stop call for the nearest approachingcar in the direction he desires to go.

By the term nearest approaching car, we mean that car whose direction oftravel and distance from said floor will permit the car stopping system(inductor relays, etc.) to stop it at that floor when it arrivesthereat. In other words, it means the car which is still capable ofbeing stopped at the floor at which the stop call is registered at thetime the call is registered.

The pressing of the button 2UB energizes the floor push buttonregistering relay ZBU by way of a circuit extending from the supplyconductor L+ (Fig. 6) through the contact members of button 2UB, thecoil 2BU, the contact members ZUPZ, conductor I34, contact'segment I35,brush B6 I, contact members BKI and the contact members EH2 tothe supplyconductor L.

The energization of the registering coil ZBU closes its contact members2BU3 and 2BU4 to complete a sell-holding circuit for itself whichextends from the supply conductor L+ to the contact members HBUII, coilZBU, the contact members 2BU3 and conductor II 3 to the supply conductorL-. The closing of the contact members 2BU4 also supplies currentthrough conductor I43 to the contact segment I28 to stop car B when itapproaches the second floor on its up trip.

The energization of the registering relay ZBU also closes its contactmembers 2BU2, thereby immediately illuminating the up floor lantern ZULBabove the door at the second floor corresponding to car B so that thewaiting passenger knows immediately that his stop call has beenregistered, that a car will stop for him in the up direction, and whichdoor will open to permit him to board the car when the car does stop forhim so that he may at once walk over to the door indicated by thelighted lantern and be ready to board the car as soon as it stops andthe door opens. The circuit for the floor lantern ZULB extends from thesupply conductor L+ (Fig. 6) through floor lantern ZULB the contactmembers 2BU2 and 2BU3 and the conductor II3 to the supply conductor L-.

The energization of the registering relay ZBU also closes its contactmembers ZBUI (bottom of sheet Fig. 4) thereby energizing the preventingrelay 2UP by a circuit extending from the supply conductor L+ throughconductor I44, coil 2UP and contact members ZBUI to the supply conductorL. The energized relay 2UP opens its contact members ZUPI in the circuitof up button 2UA at the second floor (Fig. 5) thereby preventing theregistration of a call on the up push button ZUA or the lighting of theup arrow 31 at the second floor for car A during the existence of theregistered up call at that floor for car B, even though car A passes carB after the call is registered for car B and is first to approach thefloor. Thus it is seen that after a call is registered at a floor for acar, the preventing relays prevent the registration of a call or thelighting of the direction arrows of other cars for the same direction atthe same floor.

No preventing relays are provided for the terminal floors, but eachregistering relay at the terminal floors is provided with an extra pairof normally closed contact members which open the line to the zone ringcircuit when a call is registered and thereby prevent sneak currentsthrough the ring circuits from lighting the arrows of other approachingcars. For instance, if the button IUB at the lower terminal is operated,its registering relay IBU opens its contact members iBU3 and therebyprevents the flow of current from supply conductor L through conductor II3, and contact members IBUZ and IBU3 into the direction arrows for carA if car A should come down past car B after the call is registered forcar B.

Assuming now that the car attendant on car B prepares to start the carupwardly, he thereupon operates the car switch BCS to close its Contactmembers b and c to energize the up direction switch BU and the brakerelay BQ for car B by a circuit extending from supply conductor L+through the contact members 6 and b, the contact members BDI, thecontact members BFZ, the coil BU, the door and gate interlocks EH32, andthe coil BQ to the supply conductor L.

The energization of the brake relay BQ closes its contact members BQIthereby energizing the brake magnet B6 to release the brake B5.

The energization of the up direction switch BU closes its contactmembers BUI and BU4 to supply current to the separately excited fieldwinding B23 of the generator B22, in the same manner as described forcar A and the car starts upwardly at slow speed. Further movement of thecar switch BCS closes its contact members e and 0 thereby energizing thehigh speed relay BV to close its contact members BVI to eliminate theresistor BR24 from the generator field winding, thus causing the car totravel at highspeed.

The energization of the high-speed relay also closes its contact membersBV4 thereby extinguishing the up-floor lantern IULB at the lowerterminal as the car leaves that floor.

The car switch BCS may now be returned to its center or neutralposition. As the car continues its upward approach to the second floorthe brush B63 engages the contact segment I28 which segment wasenergized by the registration of the stop call on the button 2UB secondfloor and thereby completes a circuit for energizing the floor buttonstop relay BS to stopcar B at the second floor.

The energization of the stopping relay BS closes its contact members BSIthereby energizing the slow-down holding relay BG and the inductor relayBE in preparation to decelerate from high speed.

As the car continues its approach to the second floor the inductor relayBE comes opposite the inductor plate B2UE which causes its contactmembers 3152 to open, thereby deenergizing the high-speed relay BV. Thedeenergization of the high-speed relay BV opens its contact members BVIthereby re-inserting the resistor BR24 In the field circuit of thegenerator B22 to decelerate the car to its landing speed.

The closing of the contact members BV4 of the deenergized high speedrelay will maintain the floor lantern 2ULB in a lighted condition whilecar B stops at the second floor.

The deenergization of the high-speed relay also closes its contactmembers BV3 thereby energizing the stopping inductor relay BF.

As the car continues its approach to the second floor, the stoppinginductor relay BF comes opposite the stopping inductor plate BIUF' whichopens its contact members BF2 thereby deenergizing the up directionswitch BU and the brake relay BQ. The deenergization of the up directionswitch and the brake relay deenergizes the generator field and the brakemagnet, thereby stopping the car at the second floor. As the doors (notshown) are opened the waiting passenger is ready to step aboard the carfor his upward trip.

The deenergization of the brake relay BQ also opens its contact membersBQ2 thereby deenergizing the slow-down holding relay BG, the high-speedinductor relay BE, and the stopping inductor relay BF, thus restoringthese relays to their inactive condition.

It will also be noted that as car B approached the second floor, itsbrush B65 engaged the contact segment I29 thereby energizing the zonerelay 3UZ to open its contact members 3UZ2 in the ring circuit for thepurpose of extinguishin: the direction arrow 31 for the push button 2UBat the second floor. However that arrow will remain lighted while thecar B is standing at the second fioor on its up trip because theself-holding circuit established by the registration of the up call atthat floor includes arrow 31.

Car A is standing at the third floor on its down trip and car B isstanding at the second floor on its up trip. With the cars in thesepositions, the down arrow 33 at the second floor and the up arrow 30 atthe lower terminal for car A are lighted; and the up arrow 38 at thethird floor and the down arrow II at the upper terminal for car B arelighted, thereby constituting an advance zone for car A from that car tocar B and an advance zone for car B from that car to car A. The circuitfor the arrows 33 and 30 of car A remains as previously described. Butinasmuch as car B has moved up to the second floor, its brush BGI hasmoved to the contact segment I38. Therefore, the circuit for arrows 38and 4| now extends as previously described to conductor I31 (lower endof Fig. 6) and thence through that conductor, contact segment I38, brushB6I, etc. to the supply conductor L.

It should also be noted that when an arrow for one car is illuminated ata floor to indicate that the passenger should operate the correspondingpush-button, no other push-button at that floor will register a stopcall for the same direction; that is, if the passenger presses any otherup-button than that corresponding to the lighted up arrow at a floor, astop call will not be registered. In other words, the operation of thezone relays renders the illuminated or indicated call registering meanseffective to register calls and renders ineffective all otherregistering means in the same direction for the other cars the samefloor. This prevention of the registration of stop calls uponnon-illuminated buttons follows from the zone system.

For instance, with car B now at the second floor, the up arrow 38 forcar B at the third floor is illuminated and a call may be registered onthe button 3UB for car B at that floor because the circuit for theregistering relay 3BU may be completed through conductor I31, contactsegment I38, brush BBI, etc. However, if the up push-button 3UAcorresponding to the non-i1- luminated arrow 32 for car A at the thirdfioor is operated, no call will be registered because a circuit cannotbe completed for the registering coil 3U owing to the fact that thecontact segment I40 is not engaged by a brush and the section of thering circuit comprising conductors Ill and I III with which the thirdfloor up button 3UA is connected, is dead, by reason of the opencondition of the zone relay contact members 3UZI and 3DZI.

When one car passes another car, the operation of the zone relays willtransfer the lighting of the arrows in such manner that the zone foreach car will still lie in front of that car and extend to the next carin advance thereof. As an i1- lustration of this transfer, it will beassumed that car B is moved up to the upper terminal and then down tothe lower terminal where it will remain for some time. With car A on adown trip at the third floor and car B at the lower terminal, the zonerelays 3DZ and 2DZ are energized by car A and the zone relay 2UZ isenergized by the car B, thereby lighting the down arrow 33 at the secondfloor and up arrow 30 at the lower terminal for car A, and also lightingthe up arrows 36 and 31 at the second and third floors and down arrow 4|at the upper terminal for car B. In other words, the zone for car Bextends from car B to the upper terminal and down to car A at the thirdfloor, and the zone for car A extends from car A down to car B, aspreviously described.

It will be assumed now that car A is run down .to the lower terminal andpasses car B up to the third floor. This operation of car A causessequential operation of the zone relays whereby the zone of lightedarrows for car B follows car A down to the lower terminal, but as car Apasses car 13 and moves up to and stops at the third floor, then all thelighted arrows for car B are extinguished by the operation of the zonerelays due to the movement of car A except up arrow 31 at the secondfloor for car B.

With car B remaining at the lower terminal the zone relay 2UZ stillremains energized. With car A on an up stop at the third floor, its upbrush 65 is on contact segment M2 and its brush 65a is on contactsegment I24 thereby completing circuits for energizing the zone relays3UZ and 4DZ. The zone relay contact members ZUZI, 2UZ2, 3UZI, 3UZ2, 4DZ!and 4DZ2 are now open. Inasmuch as the contact brush 6! for car A is nowon contact segment I 45 a circuit is completed for lighting the downarrows 35, 34 and 33 for car A at the fourth, third and second floors,thereby indicating to the intending down passengers at those floors thatthey should press the buttons indicated for car A to stop the nearestapproaching car for a down trip. It may be noted that the up arrow 32for car A at the lower terminal is also lighted, but as explainedbefore, this will not occasion any confusion in, the system.

Inasmuch as the brush B61 for car B is still on the up contact segmentI35 the up arrow 31 at the second floor and the up arrow 36 at the lowerterminal for car B are lighted, but because of the open contact members2UZ2 and itUZZ in the zone ring circuit, no other arrows for car B arelighted.

Hence it is seen that the down signal arrows 35, 34 and 33 for car A arelighted to define a zone from car A to car B and that the up arrow 31 atthe second floor is lighted to define a zone from car B to car A.Therefore, if waiting down passengers at any intermediate floor desire acar to stop for them, they will press the down buttons indicated by thelighted arrows for car A; and if an up passenger at the second floordesires to have an up car stop for him he will press the button ZUBindicated by the lighted arrow 31 for car B. The passengers at the lowerterminal and at the third floor who desire to move up can board the carsas they stand at those floors.

An assumed operation of the bypassing means whereby a car attendant maycause his car to bypass a stop call registered on a floor push button,without answering the call and at the same time cause the registeredcall to be transferred to the nearest approaching car in thecorresponding direction, is as follows:

It will be assumed that car B is left in its position at the lowerterminal and that car A is moved from the third floor to the upperterminal. With car A at the upper terminal, its down directionpreference relay M and its auxiliary bypass relay J for the downdirection are energized. The zone relay 3DZ is also energized by theposition of car A.

Assuming now that a waiting passenger at the second floor desires totravel downwardly and, therei ore, presses the down push button 2DAindicated by the lighted arrow 33 for car A at the second floor to causethe nearest approaching car to stop. The pressing of the button 2DAcompletes a circuit for energizing the stop call registering relay 2D,which circuit extends from the supply conductor L+ through the contactmembers of the push button 2DA, the coil 2D, the contact members 2DP I,the vertical conductor lit including the contact members ZDZI andconductor I53 to the contact segment I69, contact brush 8i (now oncontact segment I09 because of the position of car A at the upperterminal), the contact members J l and H2 to the supply conducto-r L.The energization of the registering relay 2D closes its contact members2D3 and 2D4 to complete a self-holding circuit for itself. The closingof the contact members 2D2 of the energized relay 2D completes a circuitfor lighting the floor lantern ZDLA to indicate to the passenger thathis stop call has been registered and that a car will stop for him.

Although the operation of the push button 2DA has registered thepassengers stop call for car A, it will be assumed that the attendant oncar A desires to run his car as an express from the upper terminal tothe lower terminal and thereby avoid answering any registered down callsat the intervening floors. In order to accomplish this result, the carattendant starts the car as previously described and at the same timepresses the bypass button 43 in the car to effect the transfer of anyregistered calls. The pressing of the bypass button 43 (which must becontinued during the bypassing period) energizes the bypass relay 1-1 toopen its contact members HI, H2, H3 and close the contact members H4 andH5, by a circuit extending from the supply conductor L+ (Figure 4)through conductor llll, the contact members of bypass button 43 and thecoil H to the supply conductor L-.

The opening of the contact members HI deenergizes the auxiliary bypassrelay J to open its contact members. The opening of the contact membersJ3 (Fig. 5) prevents current from flowing through the contact brush 85aand the contact segment I06 to the zone relay 3DZ, thereby deenergizingthat relay. The deenergization of the zone relay 3DZ closes its contactmembers 3DZ2 thus completing a circuit for lighting the arrows at eachfloor for car B to define the zone for car B as now extending up to theupper floor and then down to the lower terminal.

The opening of the contact members J l prevents current flowing throughthe brush 8| of car A to the zone loop circuit of car A for lighting theindicating arrows of that car at the floors. Consequently all thelighted arrows for car A are extinguished and none of them will belighted again until the bypass button 43 is released.

However the lighted down arrow 33 at the second floor will remainlighted until the car nears that floor by reason of the closed conditionof the contact members 2D3 on the registering relay.

The energization of the bypass relay H also closes its contact membersH4 for electrically connecting the brushes 86 and 81 for bypassingpurposes.

As the car A on its down trip nears the second floor, the brushes 86 and81 engage the down contact segments M9 and I50 corresponding to thesecond floor and thereby energize the bypassing transfer relay ZDT toeffect the transfer of the registered call from the registering relay2]) of car A to the registering relay 2BD for car

